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(No Model.) 2 sheets-sheen 1 A. U. ALGOGK 8U H. GALOPIN.

ARC LAMP.

No. 430,260. Patented June 17. 1890.

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ALFRED U. ALCOCK AND HENRI GALOPIN, OF MELBOURNE, VICTORIA.

ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 430,260, dated .T une 17, 1890.

Application filed April 25, 1889. Serial No. 308,602. (No model.) Patented in New Zealand October 4,1888, No. 3,283, and in Victoria. October 9, 1888.110. 6,249.

, ple Court Place, both British subjects, residing at Melbourne, in the British colony of Victoria, have in vented an automatic Compensating-Feed Electric-Arc Lamp, (for which we have obtained Letters Patent in Victoria,

No. 6,249, bearing date October 9, 1888, and

in New Zealand, where an application numbered 3,283 was filed October 4, 1888,) the following being a specification of our invention.

This invention of an automatic compensating-feed electric-arc lamp has been designed to produce an arc lamp composed of a few moving parts and having, first, an automatic feed device which imparts a practically-continuous feed to the upper carbon, such device being controlled by the electric current, and, second, an aut-omatic compensating-balance for the upper carbon. This lamp may either be arranged for running in series or parallel, the attached drawings exhibiting two forms of series lamps-viz., differential and shunt.

In the differential lamp the feed device is located under the solenoid and upon the end of a hollow .soft-iron core, which is within the solenoid, and through which core the uppercarbon-supporting bar passes. NVhen the regulating-coil is arranged as a shunt only, then the feed device is secured upon the top of the soft-iron core and above the solenoid. Such feed device consists of a grip or friction cam or clutch, between which and a rigid jaw the upper-carbon-supporting bar passes, such cam being caused to release its grip of the bar when a pin or device attached to the cam contacts with a-rigid part of the lampframe. This action takes place when the upper carbon is being fed down.

The automatic compensating-balance is constructed by suspending the upper-carbonsupporting bar by a cord, wire, or other flexible support from a small barrel having attached to its side a fusee, from which is suspended (in an opposite direction to the carbon-bar cord) a balance of the requisite weight. As alternatives for the fusee and its cord and weight, a spiral spring may be combined with the barrel or a coiled spring with its one end secured to a cord attached to the barrel and its other end secured to the lampframe.

In the accompanying drawings, Figures l and 2 show views partly in section of the differential lamp taken at rightl angles to one another, Fig. 2 being withouttlie lower framework and carbons. Fig. 3 is a plan looking upward from the line et a in Fig. 2, drawn to a larger scale and exhibiting the cam or clutch mechanism. Fig. 4 is a side View of Fig. 3, and Fig. 5 is a diagram of the differential lamp. Figs. G and 7 are views at right anglesI to one another of the working parts of the alternative construction of lamp, and Figs. 8, 9, and 10 are enlarged details of its gripclutch and the compensating-balance.

In Figs. l to 5, A is the solenoid, A the lamp-frame, and P and N the terminals of the lamp; B, the soft-iron core having at its end the rigid block B and the pivoted cam or clutch B2, the latter having an extended side arm B3, which is arranged to strike a rigid bar A of the lamp-frame. Such arm is furnished with an adjustable weight B4. C is the upper-carbon-supporting bar, and D the upper carbon. E is a counterbalancelever furnished with an adjustable weight E and having its inner bow end attached by pins to the core B. E2 is a sway-support for such lever. F is a brush forming a connection between the frame A and the rod C. G is the lower carbon. and H the lower framework of the lamp. I is the cut-out, the purpose of which is to serve as a by-passage for the current through lamp should the carbons be burned out or any accident happen to the lamp mechanism. It consists of resistance I' equal to arc, an electro-magnet I2, and armature I3. The upper end of rod C is attached by a flexible connection to a small'barrel J, arranged and secured on the same spindle as 95 a fusee J', such spindle being supported at the upper end of the lamp-frame A2. The fusee J supports by another flexible connection a balance-weight J 2, and such weight acting upon the variable diameter of the fusee at all IOO times counterbalances the weight of the upper carbon D, and also imparts a constant strain on the clutch-feed device from the time the lamp starts to burn until the carbon has burned out. The weight E is shown in the drawings as adjustable for the reason that it is so made as to slide on the lever E, and may be fixed in any position thereon by means of the set-screw zr. ln a similar manner the small weight B'1 may be made adjustable, except that the set-screw is shown omitted, as the said weight will remain by friction in any place it is put.

ln Figs. (5 to l0, which show the shunt-lamp, parts marked by lctters before referred to represent corresponding parts.

The clutch-feed device and the cut-out being tlitl'crently arranged will be now described. rlhe cam B2 has a pin B5 projecting from its side, and under such pin is arranged another pawl B", centered on a small bracket seated upon the solenoid A. The lever E is centered upon an arm-extension from the solenoid, its outer end being under the cut-out I. The armature I3 in this lamp is arranged upon and insulated from the leVerE and connected to resistance l', whose other end is connected to terminal N. K is a tensionspring acting upon lever E, and K a screwhook t'or adjusting such tension. rlhe course of the several currents in the lamp shown in Figs. l to -t will be best understood by describing same with reference to diagram, Fig. 5, in which the thick wire b is for the main current and the line wire c the shunt, while the arrows indicate the course oi currents. N ow, assuming cai-bons to he together, and consequently not lighted, the cu 1- rent entering at I will pass along main wire I), thence to brush F onto upper carbon D, and from it to lowercarbon G, thence to main Wire Zi, (or trame-work lL) through solenoid, and onto main wire leading to terminal N. The slulnt-current or tine wire is connected across from terminal to terminal, and is of a suitably high resistance, say about one hundred and eighty to two hundred ohms. The shuntcurrent enters at l) and passes through cutout, thence around main solenoid in a reverse direction to it and with a considerably more number ot turns, and thence out by terminal N. Another course for main current is from P through cut-out, and thence through wire leading to terminal N.

The action ot the lamp is as follows: The current from P passes through cai-bons, and thence through main coil, which will suck in soft-iron core, the clutch of which raises the upper-carbon bar and carbon, so as to form the arc, which, assuming the current constant, will take. up a definite length. The arc having taken up this position will now continue burning until its length will have slightlyincreased, causing a greater ditterence ot potential at terminals, and consequently greater iiow through the shunt, thereby decreasing power of main coil, which gradually lowers clutch device, causing pin projecting from cani to rest slightly on lmnp-frame, which releases carbon-holder and allows it to pass through `until the arc has again assumed its normal length, and this action is repeated until carbons are burned out.

The action ot cut-out is as follows: Suppose the iron core were to stick or the carbon-holder to have fed its whole length. The arc would gradually increase in length until an extra strong current would pass through shunt-coil, which also passes around cut-out, and so increases the power of electro-magnet to attract armature and short-circuit lamp. Through resistance the current would then ilow through thick-wire coil oit electro-magnet, which would retain armature so long as a current is passing. Again, it iron core were released, allowing the cal-bons to come together, then the current would divide and the electro-magnet would now become too weak to retain armature, when the whole current would follow origina-l course and lamp would become again lighted.

rlhe action of the lamp shown in Figs. (i to l() when it is switched into circuit is as follows: The oarbons are normally separated in order to insure the proper operation of the lamp. The current will take its course through the shunt-coil A, which sucks the iron core B in and causes pin B5 on cam B2 to engage with cam B6, when the latter, pressing under said pin B5, causes cam B2 to rise and allow the upper-carbon rod C to descend until the two cai-bons come together, which will short-circuit the shunt-coil and allow counterbalance-lever E and tension-spring K to litt iron core B and with it rod C, which is now clutched between the gripjaws B and B2, and so the carbons are retained at a sutlicient distance apart to form the arc. As the arc lengthens its resistance will increase and so cause a greater flow through coil A, it in turn sucking iron core B in until the pin again bears on cam BG and opens cam B2 to allow the rod C to gradually descend until the arc is again at its normal length.

Having thus described the nature of our said invention and the manner of performing same, we would have it understood that what we claim as of our invention is- 1. In an arc lamp, the combination of an upper-carbon-supporting bar, a friction-cani pressing thereon, an arm to said cam provided with an adjustable weight, the said arm resting upon a stationary support, such as the frame of the la1np,a solenoid provided with a hollow core through which passes the said bar and to which is pivoted the said cam, counterbalancing-weights for the said bar and the said core, and a lower carbon in circuit with the said solenoid and the upper carbon.

2. In an arc lamp, the combination ot a solenoid-core, a lever pivoted thereto and to a rod,which is in turn pivoted to a rigid support, such as the frame of the lamp, and an adjustable Weight applied to said lever.

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3. In an arc lamp, the combination of a end of which is pivoted to the said core and 1o movable solenoid-core provided with frictionthe other end of which is supplied with an cam pressing against the npper-carbon-snpadjustable weight.

porting bar, a counterbalanced arm secured to said cam and resting upon theframe of the .IIDGIOAIOCK lamp as to one arm, the other end being the pivoted end, which is attached to the cam, a, Witnesses: rod attached by a. pivot-joint to the frame of BEALINGTON BODYCOMBE, the lamp and carrying a, pivoted lever, one WILLIAM HENRY CUBLEY. 

